Habit: tree, shrub, herb, liana

Important diagnostics: aromatic oil

Taxon group: dicots

Stem: quadrangular

Leaf: position: opposite, alternate, verticillate/whorled

Leaf: nature: simple, compound

Leaf: blade: margin: lobed, cleft, parted or divided

Leaf: stipules: absent

Flowers: inflorescence: solitary, raceme, spike, head, cyme, panicle

Flowers: sexuality: bisexual, unisexual

Flowers: symmetry: actinomorphic, zygomorphic

Flowers: disc: present

Flowers: sepal number/calyx lobes: 4, 5

Flowers: sepal position: connate or basally connate

Flowers: petal number/corolla lobes: 4, 5

Flowers: petal position: connate or basally connate

Corolla: labiate

Stamen: number: 2, 4

Stamen: arrangement: didynamous, same number as petals or sepals

Stamen: anthers: opening by longitudinal slits

Stamen: filaments: free, connate into 1 tube or bundle

Stamen: other characters: staminodia present

Pistil: style: style gynobasic

Pistil: carpel: 2

Pistil: ovary: 2-loculed, 4-loculed

Pistil: ovule: 1 per locule, 2 per locule

Ovary: position: superior

Fruit: types and characters: a nut (incl. achene, caryopsis, schizocarp, pyrene, etc.)

Fruit: seed: 1 seed

Seed: endosperm: seeds without endosperm, seeds with endosperm

Google Image Search: Link

Dictionary of The Families & Genera of Chinese Seed Plants: Link

Vascular Plant Type Catalog at NYBG: Link